/Engine/Source/Runtime/GeometryCore/Public/TransformTypes.h
Surface Normals are special, their inverse transform is InverseRotate( Normalize(Scale * Normal) ) )
input surface normal with inverse transform applied.
[TVector](API\Runtime\Core\Math\TVector)< RealType > InverseTransformNormal ( const [UE::Math::TVector](API\Runtime\Core\Math\TVector)< RealType > & Normal ) const